EP1758419A1 - Procédé pour l'allocation de ressources dans un système de communication cellulaire - Google Patents

Procédé pour l'allocation de ressources dans un système de communication cellulaire Download PDF

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Publication number
EP1758419A1
EP1758419A1 EP06017455A EP06017455A EP1758419A1 EP 1758419 A1 EP1758419 A1 EP 1758419A1 EP 06017455 A EP06017455 A EP 06017455A EP 06017455 A EP06017455 A EP 06017455A EP 1758419 A1 EP1758419 A1 EP 1758419A1
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Prior art keywords
sectors
resources
sector
frequency resources
preambles
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EP06017455A
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German (de)
English (en)
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EP1758419B1 (fr
Inventor
Eung-Sun c/o Samsung El. Co. Ltd. Kim
Yung-Soo c/o Samsung El. Co. Ltd. Kim
Cheol-Woo c/o Samsung El. Co. Ltd. You
Jong-Hyung c/o Samsung El. Co. Ltd. Kwun
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/12—Fixed resource partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties

Definitions

  • the present invention relates to a cellular-based wireless communication system, and more particularly to a method for allocating resources for data transmission in a cellular-based wireless communication system employing a multicarrier scheme.
  • Frequency resources in communication systems are generally limited, and thus the broadband communication systems also have limitations on available frequency bands. Moreover, since backward compatibility with already installed communication systems must be considered, it is difficult to design the broadband communication systems.
  • Broadband communication systems as presently proposed are designed on the assumption that they use different frequency bands.
  • One of solutions is a wireless communication system employing an OFDM scheme, which reuses the same frequency bands in order to increase the efficiency of frequency use.
  • a cell is divided into a plurality of sectors, and sectors which do not neighbor each other use the same frequency bands.
  • a resource allocation method for this may be diversely implemented by taking into consideration the channel conditions of a terminal, the type of a user channel and so forth.
  • a terminal located at a cell edge is greatly influenced by interferences with a neighbor sector using the same frequency band.
  • FIG. 1 illustrates a cell structure with a frequency reuse factor of 2, and an example of downlink resource allocation for such a cell structure.
  • cells 10, 20, 30 are each divided into 6 sectors. Since the frequency reuse factor is 2, the sectors are grouped into two regions (region 1 and region 2) in which frequency resources are dividedly used. That is, the respective sectors belong to any one of the regions 1 and 2, and are separated from each other such that sectors belonging to the region 1 do not neighbor sectors belonging to the region 2. Thus, the respective sectors are not theoretically influenced by other neighbor sectors.
  • a terminal located at a cell edge 40 is greatly influenced by interferences from signals of other neighbor sectors using the same frequency resource. This is because the intensity of a signal from a base station is very low at the cell edge 40, and thus the signal is difficult to discriminat from other signals of neighbor sectors using the same frequency resource.
  • an object of the present invention is to provide a method for allocating resources according to frequency reuse in a cellular-based wireless communication system employing a multicarrier scheme.
  • a further object of the present invention is to provide a method for allocating resources in a cellular-based wireless communication system employing a multicarrier scheme, in which resources for a terminal located at a cell edge are separately allocated.
  • a further object of the present invention is to provide a method for allocating resources and receiving the allocated resources, in which when one cell is divided into sectors based upon a plurality of criteria, the sectors can be compatibly used.
  • a method for allocating resources for a downlink in a cellular-based wireless communication system in which frequency resources are divided into time slots defined by one frame and the divided time slots are allocated to an uplink and the downlink, a multicarrier scheme is used, and one cell consists of a plurality of sectors, the method comprising the hronigation steps of: allocating during a predetermined time period from a starting point of the time slots the frequency resources as resources for transmitting (sync) preambles on a sector-by-sector basis, the sync preambles using different specific frequencies having a regular interval for frame synchronization such that the plurality of sectors have mutual orthogonality, allocating during a predetermined time period from an end point of the time slots the frequency resources such that the frequency resources for the plurality of sectors are repeatedly used, according to an order of the sectors, as resources for transmitting broadcasting messages on a sector-by-sector basis; and defining an
  • a method for receiving resources allocated for a downlink in a cellular-based wireless communication system in which frequency resources are divided into time slots defined by one frame and the divided time slots are allocated to an uplink and the downlink, a multicarrier scheme is used, one cell consists of a plurality of sectors, and cells different in number of sectors are mixed-used, the method comprising the steps of: allocating during a predetermined time period from a starting point of the time slots the frequency resources as resources for transmitting sync preambles on a sector-by-sector basis, the sync preambles using different specific frequencies having a regular interval for frame synchronization such that the plurality of sectors have mutual orthogonality, ; when a cell consisting of N sectors is used together with a cell consisting of 2N sectors, corresponding pairs of two neighbor sectors of the cell consisting of the 2N sectors are used in the cell consisting of the N sectors, and allocating the frequency resources such that if an interval of the frequency resources allocated
  • resource allocation in the present invention will be described using a frame structure. That is, a description of resource allocation will be given by setting forth how resources that are allocated to each terminal within a cell are mapped and transmitted in a frame.
  • the present invention relates to a method for allocating resources in a cellular-based wireless communication system using a multicarrier scheme, which includes 6-sector cells with a frequency reuse factor of 2.
  • FIG. 2 illustrates a frame structure for a downlink in accordance with a first preferred embodiment of the present invention.
  • a frame for a downlink includes a synchronization (sync) preamble 210, a reuse 6 subchannel 220, an AMC (Adaptive Modulation and Coding) channel 230, diversity channels 240, 260, and a channel estimation midamble 250 in a time domain.
  • sync synchronization
  • AMC Adaptive Modulation and Coding
  • the sync preamble 210 is used for frame synchronization of a terminal, includes location information of reuse 2 subchannels, that is, the AMC channel 230 and the diversity channels 240, 260, and location information of the reuse 6 subchannel 220, and becomes a criterion for handoff of the diversity channels 240, 260. Since the criterion for handoff of the diversity channels 240, 260 is an average receive power over all subcarriers, and the sync preamble 210 is means measuring the average receive power over all of the subcarriers, the handoff of the diversity channels 240, 260 is performed using the sync preamble 210.
  • the sync preambles 210 are configured at a regular frequency interval in a frequency domain as shown in FIG. 3, and sync preamble signals between the sectors have mutual orthogonality.
  • a terminal having received the sync preambles 210 selects a sync preamble having a maximum peak value after correlation for the received sync preambles, and performs synchronization with a frame corresponding to the selected sync preamble. That is, the terminal is synchronized with a sector having the greatest average power over all of the channels.
  • information related to the type of sync preamble may be included in information on a cell or a sector, which a base station transmits.
  • the channel estimation midamble 250 is a channel estimation midamble for DCA (Dynamic Channel allocation), and becomes a criterion for basing handoff of the AMC channel 230.
  • the criterion for handoff of the AMC channel 230 is not an average receive power over all subcarriers, but is whether or not a subchannel more favorable to the AMC channel exists within a cell, to which the terminal belongs, and neighbor cells. For example, there may be a specific subchannel which has a lower average power, but is more favorable to the AMC channel.
  • the channel estimation midamble 240 can measure power on a subchannel-by-subchannel basis, the channel estimation midamble 250 is used as the criterion for handoff of the AMC channel 230.
  • the reuse 6 subchannel 220 is a channel for transmitting essential broadcasting messages, and transmits multicast messages or dedicated data (messages) for a terminal, which has an inferior SINR (Signal to Interference plus Noise Ratio) due to being located at a cell edge, according to a given situation.
  • the entire frequency resources are divided into 6 reuse 6 subchannels 220 and the divided 6 subchannels are successively allocated to 6 sectors.
  • the subchannels, each of which consists of a plurality of subcarriers are more in number than the sectors, the 6 sectors repeatedly use the subchannels at an interval of 6 subchannels.
  • FIG. 2 shows that the reuse 6 subchannels 220 are allocated at an interval of 6 subchannels for one sector.
  • a plurality of terminals belonging to the same sector use subchannels allocated to the corresponding sector. On a sector-by-sector basis, a plurality of terminals belonging to one sector use subchannels allocated at an interval of 6 subchannels. Then, since sync preambles 210, sectors and reuse 6 subchannels correspond on a one-to-one basis , the terminal can determine which reuse 6 subchannel 220 it must detect from among the 6 types of reuse 6 subchannels 220.
  • a terminal located at a cell edge can use the sync preamble 210 for detecting the location of the reuse 6 subchannel 220 to be used for its downlink data transmission.
  • the AMC channel 230 is a channel for transmitting data to a terminal using the AMC channel 230
  • the diversity channels 240, 260 are channels for transmitting data to a terminal using the diversity channels 240, 260.
  • These AMC channel 230 and diversity channels 240, 260 are reuse 2 subchannels, and are different from the reuse 6 subchannel 220.
  • Every terminal within a cell synchronizes a frame with a sector to which the terminal belongs, through the sync preamble 210, and detects the location of a channel for transmitting data corresponding to the terminal, that is, the reuse 6 subchannel 220, the AMC channel 230 or the diversity channels 240, 260 in order to receive data at the corresponding location.
  • the resource allocation method is characterized in that a cell with a frequency reuse factor of 2 is divided into 6 sectors, each sector is divided into an AMC channel region 310, which is located in the center of the cell and in which the intensity of signals from a base station is strong and there is little interference influence, a diversity channel region 320, in which the intensity of signals is weaker than in the AMC channel region 310, but there is only a little interference influence, and an edge region 330 farthest from the base station, in which the intensity of signals is weak and there is much interference influence, as shown in FIG. 4, and resources for data transmission are differently allocated according to the respective regions 310 to 330 as in FIG. 2.
  • the channel estimation midamble 250 refers to a pilot signal having a specific pattern, which is transmitted simultaneously with the data, and a predefined pilot signal must be transmitted regardless of whether or not transmission data exists. Also, a frequency-domain signal of the channel estimation midamble 250 successively divides the respective sectors into odd sectors and even sectors, and uses 3 specific patterns in the odd and even sectors, respectively. Thus, there exist 6 types of channel estimation midambles 250.
  • the pattern means that the same frequency is used, but 3 different values allocated to the frequency exist. That is, the 3 sectors of the odd sectors use different patterns, but their frequencies are all the same.
  • frequency resources are divided into two ones, one of which is used in the odd sector and the other of which is used in the even sector, and every 3 odd sectors use different patterns of channel estimation midambles 250 and every 3 even sectors use different patterns of channel estimation midambles 250.
  • a total 6 types of channel estimation midambles 250 can be used while corresponding on a one-to-one basis to the sync preambles 210 divided into 6 types as in FIG. 3.
  • a cell with frequency reuse factor of 2 is divided into 6 sectors, resources are separately allocated to physical channels having different characteristics, and particularly a reuse 6 subchannel is used for a terminal located in a cell edge region.
  • FIG. 6 illustrates a frame structure for a downlink in accordance with the second preferred embodiment of the present invention.
  • a frame for a downlink includes a sync preamble 610, a reuse 3 subchannel 620, an AMC channel 630, diversity channels 640, 660, and a channel estimation midamble 650 in a time domain.
  • the sync preamble 610 is used for frame synchronization of a terminal, includes location information of the AMC channel 630 and the diversity channels 640, 660 using the entire frequency band and location information of the reuse 3 subchannel, and becomes the criterion for the handoff of the diversity channels 640,660.
  • the 6 sync preambles used in the first embodiment are grouped into pairs and each pair of sync preambles is used in one sector in the second embodiment.
  • the sync preambles 610 are configured at a regular frequency interval in a frequency domain as shown in FIG. 7.
  • the sync preamble signals for each sector 810 to 830 are configured at an interval of half of the signal interval in FIG. 3. This is because a cell in FIG. 7 consists of 3 sector and a cell in FIG. 3 consists of 6 sectors, and thus one sector in FIG. 7 uses signals to be used in two sectors in FIG. 3. That is, if one sector 810 in FIG. 7 uses the sync preambles of the sectors 410, 440 in FIG. 3, another sector 820 in FIG. 7 uses the sync preambles of the sectors 420, 450 in FIG.
  • the other sector 830 in FIG. 7 uses the sync preambles of the sectors 430, 460 in FIG. 3.-,
  • the three sectors 810 to 830 can be configured at the same frequency so as to have mutual orthogonality. In this way, a 3 sector-cell and a 6-sector cell can be interchangeably implemented according to circumstances.
  • a terminal having received the sync preambles 610 selects a sync preamble having a maximum peak value after correlation for the received sync preambles, and performs synchronization with a frame corresponding to the selected sync preamble.
  • the terminal is synchronized with a sector having the greatest average power over the entire channels.
  • the channel estimation midamble 650 is a channel estimation midamble for DCA, and becomes a criterion for handoff of the AMC channel 630.
  • the reuse 3 subchannel 620 is a channel for transmitting essential broadcasting messages, and transmits multicast messages or dedicated data (messages) for a terminal having an inferior SINR due to being located at a cell edge. All of the frequency resources are divided into 3 reuse 3 subchannels 620 and the divided 3 subchannels are successively allocated to 3 sectors. When the subchannels, each of which consists of a plurality of subcarriers, are greater in number than the sectors, the 3 sectors repeatedly use the subchannels at an interval of 3 subchannels.
  • FIG. 6 shows that the reuse 3 subchannels 620 are allocated at an interval of 3 subchannels for one sector.
  • a plurality of terminals belonging to the same sector use subchannels allocated to the corresponding sector.
  • On a sector-by-sector basis a plurality of terminals belonging to one sector use subchannels allocated at an interval of 3 subchannels. Then, since sync preambles 610, sectors and reuse 3 subchannels correspond on a one-to-one basis, the terminal can determine which reuse 3 subchannel 620 it must detect from among the 3 types of reuse 3 subchannels 620.
  • a terminal located at a cell edge can use the sync preamble 610 for detecting the location of the reuse 3 subchannel 620 to be used for its downlink data transmission.
  • each of the sync preambles 610 of the sectors 810 to 830 located at a cell edge in FIG. 7 corresponds one-to-one to a reuse 3 subchannel 620 to be used in its own sector, and thus a subchannel corresponding to the frequency location of the sync preamble 610 becomes none other than a reuse 3 subchannel to be used for a terminal located at a cell edge in the sector to which the sync preamble 610 belongs. Therefore, since the terminal located at a cell edge uses a subchannel of a frequency band having orthogonality to those of neighbor sectors, it is not influenced by interferences from the neighbor sectors.
  • the AMC channel 630 is a channel for transmitting data to a terminal using the AMC channel 630
  • the diversity channels 640, 660 are channels for transmitting data to a terminal using the diversity channels 640, 660.
  • These AMC channel 630 and diversity channels 640, 660 do not use a frequency band in the unit of a subchannel, but use the overall frequency band.
  • Every terminal within a cell synchronizes a frame with a sector, to which the terminal belongs, through the sync preamble 610, and detects the location of a channel for transmitting data corresponding to the terminal. That is, the reuse 3 subchannel 620, the AMC channel 630 or the diversity channels 640, 660 to receive data at the corresponding location.
  • the resource allocation method is characterized in that a cell is divided into 3 sectors, each sector is divided into an AMC channel region 710, which is located in the center of the cell and in which the intensity of signals from a base station is strong and there is little interference influence, a diversity channel region 720, in which the intensity of signals is weaker than in the AMC channel region 710, but there is only a little interference influence, and an edge region 730 farthest from the base station, in which the intensity of signals is weak and there is much interference influence, as shown in FIG. 7, and resources for data transmission are differently allocated according to the respective regions 710 to 730 as in FIG. 7.
  • the channel estimation midamble 650 refers to a pilot having a specific pattern, which is transmitted simultaneously with the data, and a predefined pilot signed must be transmitted regardless of whether or not transmission data exists. Also, a frequency-domain signals of the channel estimation midamble 650 exists in three types from sector-to-sector, and the three types of channel estimation midambles 650 can be used on a sector-by-sector basis while corresponding on a one-to-one basis with the sync preambles 610 divided into 3 types as in FIG. 7.
  • the resource allocation method according to the second preferred embodiment of the present invention has a feature in that a cell is divided into 3 sectors, resources are separately allocated to physical channels having different characteristics, and particularly a reuse 3 subchannel is used for a terminal located in a cell edge region.
  • a terminal must determine, through the sync preamble, if it is located in a 3-sector cell or a 6-sector cell, and receive data over a data channel corresponding to its location.
  • FIG. 9 is a flowchart illustrating a method, in which when resources are allocated according to the first and second embodiments, a terminal receives the allocated resources and determines in which sector it is located.
  • the terminal correlates all of the received sync preambles (S910). After the correlation, the terminal compares positions and values for peaks of the respective sync preambles with each other (S920). At this time, for the comparison, it is assumed that for signals in FIG. 7, that is, sync preambles in the case of a 3-sector cell, a position interval between signals, which are used in one sector, on a time axis has a threshold of Th time , and a power difference between the signals has a threshold of Th power .
  • the terminal assumes that it is currently located in any one sector of a 3-sector cell as in FIG. 7, and decodes a corresponding reuse 3 subchannel to perform a CRC (Cyclic Redundancy Check) check (S940).
  • CRC Cyclic Redundancy Check
  • step S950 the terminal determines that it is currently located in any one sector of the 3-sector cell (S960).
  • the terminal assumes that it is currently located in any one sector of a 6-sector cell as in FIG. 3, and decodes a corresponding reuse 6 subchannel to perform a CRC check (S970).
  • step S990 the terminal determines that it is currently located in any one sector of the 6-sector cell (S990).
  • the terminal determines its channel conditions as incapable of reception (S1000).
  • the present invention produces excellent resistance to inter-sector or inter-cell interferences at a cell edge by providing a resource allocation method and a terminal for receiving the resources allocated according to such a method in a cellular-based wireless communication system employing a multicarrier scheme.
  • handoffs of diversity channels and an AMC channel can be distinctively performed.
  • the present invention provides a cell structure or a sector structure, in which a cell with a frequency reuse factor of 2 is divided into 6 sectors, and resources are dividedly allocated to a plurality of physical channel regions of each sector such that there is no inter-sector interference.
  • the present invention provides a cell structure or a sector structure, in which a cell is divided into 3 sectors, and resources are dividedly allocated to a plurality of physical channel regions of each sector such that there is no inter-sector interference.
  • the number of sectors that the cell is dividable into is only limited to system design and requirements. And, although cells having 3 or 6 sectors have been described herein, the present invention can apply to cells having various numbers of sectors.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
EP06017455A 2005-08-22 2006-08-22 Procédé pour l'allocation de ressources dans un système de communication cellulaire Active EP1758419B1 (fr)

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KR1020050077016A KR100965677B1 (ko) 2005-08-22 2005-08-22 다중반송파 방식을 사용하는 셀룰러 기반의 무선통신시스템에서의 자원할당 방법 및 할당된 자원을 수신하는방법

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KR100965677B1 (ko) 2010-06-24
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KR20070022566A (ko) 2007-02-27
US20070049283A1 (en) 2007-03-01

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